This is all the output I have:
@Starting C:\Coding\Qt\OnTime-build-simulator\debug\OnTime.exe...
startRequest() for "http://m.sumc.bg/vt?q=1287&go=1"
before sumcClient
asisted sumcClient
finishedDownload() for "http://m.sumc.bg/vt?q=1287&go=1"
emitted downloaded
C:\Coding\Qt\OnTime-build-simulator\debug\OnTime.exe exited with code 0@

I had a quick glance at your code. I saw that you emit downloaded successfully. Signal downloaded is connected to signal contentReady and in MainWindow contentReady is connected to slot insertHtml, right?

Is the contentReady signal also emitted successfully? Is everything with the QTextEdit ui->uiInformation OK?